California Code, Penal Code - PEN § 852.2

Any peace officer of another State, who enters this State in fresh pursuit, and continues within this State in fresh pursuit, of a person in order to arrest him on the ground that he has committed a felony in the other State, has the same authority to arrest and hold the person in custody, as peace officers of this State have to arrest and hold a person in custody on the ground that he has committed a felony in this State.